自学教程：C++ IsFocus函数代码示例

void LiveTextView::Draw(BRect updateRect) {	BTextView::Draw( updateRect );	BRect bounds( Bounds() );	SetHighColor( 184, 184, 184 );	StrokeLine( bounds.RightTop(), bounds.LeftTop() );	StrokeLine( bounds.LeftBottom() );	SetHighColor( 255, 255, 255 );	StrokeLine( bounds.RightBottom() );	StrokeLine( bounds.RightTop() );	bounds.InsetBy( 1.0, 1.0 );	if (IsFocus()) SetHighColor( 0, 0, 229 );	else SetHighColor( 96, 96, 96);		StrokeLine( bounds.RightTop(), bounds.LeftTop() );	StrokeLine( bounds.LeftBottom() );	if (IsFocus()) SetHighColor( 0, 0, 229 );	else SetHighColor( 216, 216, 216 );	StrokeLine( bounds.RightBottom() );	StrokeLine( bounds.RightTop() );}

voidETextEditable::DrawCursor(){	if(!IsEnabled() || !IsEditable() || fPosition < 0 || fPosition > fCount || (fCount > 0 && fCharWidths == NULL)) return;	if(Window() == NULL || Window()->IsActivate() == false) return;	if(!(IsFocus() || IsFocusChanging())) return;	ERect rect = Frame().OffsetToSelf(E_ORIGIN);	rect.left += fMargins.left;	rect.top += fMargins.top;	rect.right -= fMargins.right;	rect.bottom -= fMargins.bottom;	if(!rect.IsValid()) return;	EFont font;	e_font_height fontHeight;	GetFont(&font);	font.GetHeight(&fontHeight);	float sHeight = fontHeight.ascent + fontHeight.descent;	EPoint pt1;	if(!GetCharLocation(fPosition, &(pt1.x), NULL, &font)) return;	pt1.x -= 1;	pt1.y = rect.Center().y - sHeight / 2.f;	EPoint pt2 = pt1;	pt2.y += sHeight;	e_rgb_color crColor = e_ui_color(E_DOCUMENT_CURSOR_COLOR);	if(IsFocusChanging() && !IsFocus())	{		if(fPosition > fSelectStart && fPosition <= fSelectEnd && fSelectEnd > fSelectStart)		{			crColor = e_ui_color(E_DOCUMENT_HIGHLIGHT_COLOR);		}		else		{			crColor = e_ui_color(E_DOCUMENT_BACKGROUND_COLOR);		}	}	PushState();	SetDrawingMode(E_OP_COPY);	SetPenSize(0);	SetHighColor(crColor);	StrokeLine(pt1, pt2, E_SOLID_HIGH);	PopState();}

//------------------------------------------------------------------------------void BControl::WindowActivated(bool active){	BView::WindowActivated(active);	if (IsFocus())		Invalidate(Bounds());}

voidBRadioButton::MouseDown(BPoint where){	if (!IsEnabled() || !QueryCurrentMouse(true, B_PRIMARY_MOUSE_BUTTON)) return;#if 0	font_height fontHeight;	GetFontHeight(&fontHeight);	float sHeight = fontHeight.ascent + fontHeight.descent;	BRect rect = Frame().OffsetToSelf(B_ORIGIN);	rect.InsetBy(5, (rect.Height() - sHeight) / 2);	if (rect.IsValid() == false) return;	rect.right = rect.left + rect.Height();	if (rect.Contains(where) == false) return;#endif	if ((Flags() &B_NAVIGABLE) && !IsFocus()) MakeFocus();//	SetValue((Value() == B_CONTROL_ON) ?B_CONTROL_OFF :B_CONTROL_ON);	if (Value() == B_CONTROL_ON) return;	SetValue(B_CONTROL_ON);	Invoke();}

/*!	/brief Actually draws the title	The main tasks for this function are to ensure that the decorator draws	the title only in its own area and drawing the title itself.	Using B_OP_COPY for drawing the title is recommended because of the marked	performance hit of the other drawing modes, but it is not a requirement.	/param tab The /a tab to update.	/param rect area of the title to update.*/voidWinDecorator::_DrawTitle(Decorator::Tab* tab, BRect rect){	const BRect& tabRect = tab->tabRect;	const BRect& minimizeRect = tab->minimizeRect;	const BRect& zoomRect = tab->zoomRect;	const BRect& closeRect = tab->closeRect;	fDrawingEngine->SetHighColor(fTextColor);	fDrawingEngine->SetLowColor(IsFocus(tab)		? fFocusTabColor : fNonFocusTabColor);	tab->truncatedTitle = Title(tab);	fDrawState.Font().TruncateString(&tab->truncatedTitle, B_TRUNCATE_END,		((minimizeRect.IsValid() ? minimizeRect.left :			zoomRect.IsValid() ? zoomRect.left :			closeRect.IsValid() ? closeRect.left : tabRect.right) - 5)		- (tabRect.left + 5));	tab->truncatedTitleLength = tab->truncatedTitle.Length();	fDrawingEngine->SetFont(fDrawState.Font());	font_height fontHeight;	fDrawState.Font().GetHeight(fontHeight);	BPoint titlePos;	titlePos.x = tabRect.left + 5;	titlePos.y = floorf(((tabRect.top + 2.0) + tabRect.bottom			+ fontHeight.ascent + fontHeight.descent) / 2.0			- fontHeight.descent + 0.5);	fDrawingEngine->DrawString(tab->truncatedTitle, tab->truncatedTitleLength,		titlePos);}

void ArpIntControl::DrawOn(BRect updateRect, BView* view){	BRect		cb = ControlBounds();	float		textY = cb.top + Prefs().GetInt32(ARP_FULLFONT_Y);	if (mDivider > 0) {		view->SetHighColor(mViewColor);		view->FillRect( BRect(0, cb.top, cb.left, cb.bottom) );		if (mLabel.Length() > 0) {			if ( IsFocus() ) view->SetHighColor( Prefs().GetColor(ARP_INT_FGF_C));			else if ( !IsEnabled() ) view->SetHighColor( tint_color(Prefs().GetColor(ARP_INT_FG_C), B_LIGHTEN_1_TINT) );			else view->SetHighColor( Prefs().GetColor(ARP_INT_FG_C) );			view->SetLowColor(mViewColor);			view->DrawString( mLabel.String(), BPoint(0, textY) );		}	}	DrawControlBackgroundOn(cb, view);	BPoint			drawPt(cb.left + 3, textY);	if (IsEnabled() == false) {		drawPt.x++;		drawPt.y++;	}	BString16		str;	GetValueLabel(Value(), str);	SetValueColor(view);	view->DrawString( str.String(), drawPt );}

voidTextDocumentView::MakeFocus(bool focus){	if (focus != IsFocus())		Invalidate();	BView::MakeFocus(focus);}

int UITouchButton::GetTextHeight(){    if (m_strText.Length() > 0)    {        m_ifontAttr.m_iFace=FONT_DEFAULT;                ITpFont* pFont = NULL;        if (IsFocus())        {            pFont = FontManager::GetInstance()->GetFont(m_ifontAttr, m_iFocusedFontColor);        }        else        {            pFont = FontManager::GetInstance()->GetFont(m_ifontAttr, GetFontColor());        }        if(NULL == pFont)        {	        DebugPrintf(DLC_CHENM, "UITouchButton::Draw()  End: pFont = NULL");            return E_FAIL;        }        int _iStringHeight = pFont->GetHeight();        return _iStringHeight;    }    return -1;}

void_BTextInput_::MakeFocus(bool state){	if (state == IsFocus())		return;	BTextView::MakeFocus(state);	if (state) {		SetInitialText();		SelectAll();	} else {		if (strcmp(Text(), fPreviousText) != 0)			TextControl()->Invoke();		free(fPreviousText);		fPreviousText = NULL;	}	if (Window() != NULL) {		// Invalidate parent to draw or remove the focus mark		if (BTextControl* parent = dynamic_cast<BTextControl*>(Parent())) {			BRect frame = Frame();			frame.InsetBy(-1.0, -1.0);			parent->Invalidate(frame);		}	}}

voidBChannelSlider::MakeFocus(bool focusState){	if (focusState && !IsFocus())		fFocusChannel = -1;	BChannelControl::MakeFocus(focusState);}

voidBPictureButton::Draw(BRect updateRect){	if (IsEnabled()) {		if (Value() == B_CONTROL_ON)			DrawPicture(fEnabledOn);		else			DrawPicture(fEnabledOff);	} else {		if (fDisabledOff == NULL			|| (fDisabledOn == NULL && fBehavior == B_TWO_STATE_BUTTON))			debugger("Need to set the 'disabled' pictures for this BPictureButton ");		if (Value() == B_CONTROL_ON)			DrawPicture(fDisabledOn);		else			DrawPicture(fDisabledOff);	}	if (IsFocus()) {		SetHighColor(ui_color(B_KEYBOARD_NAVIGATION_COLOR));		StrokeRect(Bounds(), B_SOLID_HIGH);	}}

//------------------------------------------------------------------------------void BMenuField::WindowActivated(bool state){	BView::WindowActivated(state);	if (IsFocus())		Draw(Bounds());}

void EditWidget::renderText(){	bool cv = cursor_visible;	if (!IsFocus()) {		cv = false;	} else {		uint32 now = SDL_GetTicks();		if (now > cursor_changed + 750) {			cv = !cursor_visible;			cursor_changed = now;		}	}	if (cv != cursor_visible) {		FORGET_OBJECT(cached_text);		cursor_visible = cv;	}	if (!cached_text) {		Pentagram::Font *font = getFont();		int max_width = multiline ? dims.w : 0;		int max_height = dims.h;		if (gamefont && font->isHighRes()) {			int x = 0, y = 0;			GumpRectToScreenSpace(x, y, max_width, max_height, ROUND_INSIDE);		}		unsigned int remaining;		cached_text = font->renderText(text, remaining,									   max_width, max_height,									   Pentagram::Font::TEXT_LEFT,									   false, cv ? cursor : std::string::npos);	}}

// DrawvoidBoolValueView::Draw(BRect updateRect){	BRect b(Bounds());	// focus indication	if (IsFocus()) {		SetHighColor(ui_color(B_KEYBOARD_NAVIGATION_COLOR));		StrokeRect(b);		b.InsetBy(1.0, 1.0);	}	// background	FillRect(b, B_SOLID_LOW);	// checkmark box	rgb_color crossOutline = kBlack;	rgb_color crossColor = ui_color(B_KEYBOARD_NAVIGATION_COLOR);	if (!fEnabled) {		crossOutline = tint_color(crossOutline, B_LIGHTEN_2_TINT);		crossColor = tint_color(crossColor, B_LIGHTEN_2_TINT);	}	SetHighColor(crossOutline);	b = fCheckBoxRect;	StrokeRect(b);	// checkmark	if (fProperty && fProperty->Value()) {		SetHighColor(crossColor);		b.InsetBy(3.0, 3.0);		SetPenSize(2.0);		StrokeLine(b.LeftTop(), b.RightBottom());		StrokeLine(b.LeftBottom(), b.RightTop());	}}

voidMemoryView::MouseDown(BPoint point){	if (!IsFocus())		MakeFocus(true);	if (fTargetBlock == NULL)		return;	int32 buttons;	if (Looper()->CurrentMessage()->FindInt32("buttons", &buttons) != B_OK)		buttons = B_PRIMARY_MOUSE_BUTTON;	if (buttons == B_SECONDARY_MOUSE_BUTTON) {		_HandleContextMenu(point);		return;	}	int32 offset = _GetOffsetAt(point);	if (offset < fSelectionStart || offset > fSelectionEnd) {		BRegion oldSelectionRegion;		_GetSelectionRegion(oldSelectionRegion);		fSelectionBase = offset;		fSelectionStart = fSelectionBase;		fSelectionEnd = fSelectionBase;		Invalidate(oldSelectionRegion.Frame());	}	SetMouseEventMask(B_POINTER_EVENTS, B_NO_POINTER_HISTORY);	fTrackingMouse = true;}

void_BMCMenuBar_::Draw(BRect updateRect){	if (fFixedSize) {		// Set the width of the menu bar because the menu bar bounds may have		// been expanded by the selected menu item.		ResizeTo(fMenuField->_MenuBarWidth(), Bounds().Height());	} else {		// For compatability with BeOS R5:		//  - Set to the minimum of the menu bar width set by the menu frame		//    and the selected menu item width.		//  - Set the height to the preferred height ignoring the height of the		//    menu field.		float height;		BMenuBar::GetPreferredSize(NULL, &height);		ResizeTo(std::min(Bounds().Width(), fMenuField->_MenuBarWidth()),			height);	}	BRect rect(Bounds());	rgb_color base = ui_color(B_MENU_BACKGROUND_COLOR);	uint32 flags = 0;	if (!IsEnabled())		flags |= BControlLook::B_DISABLED;	if (IsFocus())		flags |= BControlLook::B_FOCUSED;	be_control_look->DrawMenuFieldBackground(this, rect,		updateRect, base, fShowPopUpMarker, flags);	_DrawItems(updateRect);}

voidMemoryView::MouseDown(BPoint point){	if (!IsFocus())		MakeFocus(true);	BView::MouseDown(point);}

void_BMCMenuBar_::MakeFocus(bool focused){	if (IsFocus() == focused)		return;	BMenuBar::MakeFocus(focused);}

voidBMenuField::WindowActivated(bool state){	BView::WindowActivated(state);	if (IsFocus())		Invalidate();}

// MakeFocusvoidAlphaSlider::MakeFocus(bool focus){	if (focus != IsFocus()) {		BControl::MakeFocus(focus);		Invalidate();	}}

    void MakeFocus(bool focusState=true)    {        if( Window() && Parent() && IsFocus() != focusState ) {            BMessage msg(focusState ? INLINE_STARTFOCUS_MSG:INLINE_ENDFOCUS_MSG);            mOwner.SendMessage(&msg);        }        inherited::MakeFocus(focusState);    }

// MakeFocusvoidPropertyListView::MakeFocus(bool focus){	if (focus == IsFocus())		return;	BView::MakeFocus(focus);	if (::ScrollView* scrollView = dynamic_cast< ::ScrollView*>(Parent()))		scrollView->ChildFocusChanged(focus);}

//------------------------------------------------------------------------------void BMenuField::MakeFocus(bool state){	if (IsFocus() == state)		return;	BView::MakeFocus(state);	if(Window())		Draw(Bounds()); // TODO: use fStringWidth}

void cgUILineEdit::UpdateSelf( float fTime ){	if (IsFocus() && fTime - m_fLastUpdateTime > 0.5f)	{		m_fLastUpdateTime = fTime;		m_bCursorVisible = !m_bCursorVisible;		ReportDirty();	}}

voidURLInputGroup::URLTextView::MouseDown(BPoint where){	bool wasFocus = IsFocus();	if (!wasFocus)		MakeFocus(true);	int32 buttons;	if (Window()->CurrentMessage()->FindInt32("buttons", &buttons) != B_OK)		buttons = B_PRIMARY_MOUSE_BUTTON;	if ((buttons & B_SECONDARY_MOUSE_BUTTON) != 0) {		// Display context menu		int32 selectionStart;		int32 selectionEnd;		GetSelection(&selectionStart, &selectionEnd);		bool canCutOrCopy = selectionEnd > selectionStart;		bool canPaste = false;		if (be_clipboard->Lock()) {			if (BMessage* data = be_clipboard->Data())				canPaste = data->HasData("text/plain", B_MIME_TYPE);			be_clipboard->Unlock();		}		BMenuItem* cutItem = new BMenuItem(B_TRANSLATE("Cut"),			new BMessage(B_CUT));		BMenuItem* copyItem = new BMenuItem(B_TRANSLATE("Copy"),			new BMessage(B_COPY));		BMenuItem* pasteItem = new BMenuItem(B_TRANSLATE("Paste"),			new BMessage(B_PASTE));		BMenuItem* clearItem = new BMenuItem(B_TRANSLATE("Clear"),			new BMessage(MSG_CLEAR));		cutItem->SetEnabled(canCutOrCopy);		copyItem->SetEnabled(canCutOrCopy);		pasteItem->SetEnabled(canPaste);		clearItem->SetEnabled(strlen(Text()) > 0);		BPopUpMenu* menu = new BPopUpMenu("url context");		menu->AddItem(cutItem);		menu->AddItem(copyItem);		menu->AddItem(pasteItem);		menu->AddItem(clearItem);		menu->SetTargetForItems(this);		menu->Go(ConvertToScreen(where), true, true, true);		return;	}	// Only pass through to base class if we already have focus.	if (!wasFocus)		return;	BTextView::MouseDown(where);}

voidBListView::MakeFocus(bool focused){	if (IsFocus() == focused)		return;	BView::MakeFocus(focused);	if (fScrollView)		fScrollView->SetBorderHighlighted(focused);}

// SetValuevoidStringTextView::SetValue(const char* string){	SetText(string);	// update cache	Value();	if (IsFocus())		SelectAll();}

voidInputTextView::MakeFocus(bool focus){	if (focus != IsFocus()) {		if (BView* view = Parent())			view->Invalidate();		BTextView::MakeFocus(focus);		if (focus)			SelectAll();	}}